A. J. C. Wilson

TL;DR: The Subcommittee has attempted to elucidate the nature of problems encountered in the definition and use of statistical descriptors as applied to crystallography and to propose procedural improvements.

TL;DR: Schwarzenbach, Abrahams, Flack, Gonschorek, Hahn, Huml, Marsh, Prince, Robertson, Rollett & Wilson as discussed by the authors presented the concepts of standard uncertainty, of combined standard uncertainty and of Type A and Type B evaluations of standard uncertainties.

TL;DR: In this paper, standard symbols representing crystal families, two-dimensional Bravais-lattice types and arithmetic classes are recommended for use by the IUCr, and six crystal families are designated by lower-case letters.

TL;DR: De Wolff et al. as discussed by the authors proposed a new printed symbol for symmetry elements in the Hermann-Mauguin symbol of five different space groups and a new symbol for planes projected in a direction parallel to the plane to remove the ambiguity of their present designation.

TL;DR: In this article, a geometric element is defined, for any given symmetry operation, as a geometric item that allows the operation (after removing any intrinsic translation) to be located and oriented.